Obviously, I did a terrible job describing my problem. Let me retry --

I have no problem running the app. It works fine if I invoke it as a standalone server like so.

$ GITALIST_CONFIG=/path/to/gitalist.conf gitalist_server.pl
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Now I view the web site at http://127.0.0.1:3000. I can do a similar thing with plackup, and even specify a different port. All is good. However, I want to access the site at http://mywebserver.edu./gitalist. So, I set up an apache config file for the gitalist website like so

ProxyRequests Off

<Proxy *>
        Order deny,allow
        Allow from all
</Proxy>
    
ProxyPass        /gitalist http://127.0.0.1:3000
ProxyPassReverse /gitalist http://127.0.0.1:3000
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Then I started the built-in gitalist server like above

$ GITALIST_CONFIG=/path/to/gitalist.conf gitalist_server.pl
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Now I can go to http://mywebserver.edu./gitalist and the gitalist web site appears, except, all the internal links still point to http://127.0.0.1:3000. As a result, none of the CSS or the images appear correctly. All these links should be pointing to http://mywebserver.edu./gitalist. So, http://127.0.0.1:3000/path/to/gitalist.css should be http://mywebserver.edu./gitalist/path/to/gitalist.css. I don't see any Gitalist config option that allows me to change these links. And, this can't be solved with mod_rewrite.

I hope my issue is clearer now. I will also update the original post with this information.